System of distribution.



J. L. HALL & A. ,F. KNIGHT.

SYSTEM OF DISTRIBUTION.

APPLICATION FILED AUG. 21, 1905.

92%6935 Patented May 18,1909.

UNITED PATENT JOHN L. HALL AND ARTHUR F. KNIGHT, OF SCHENECTADY, NEW YORK, ASSIGNOR S TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

SYSTEM or nrsrnrnurron.

Specification of Letters Patent.

Patented May 18,'1909.

Application filed August 21, 1905. Serial N0. 27 ,989.

on ordinary supply circuits on shipboard or elsewhere, it 15 necessary to" provide in series with each lamp or projector a large amount of regulating resistance. Inasmuch as this involves an excessive waste of energy in the operation of the lamp or projector, it is one of the objects of our invention to provide an improved system of supply whereby the use o1 such resistance may be avoided.

To this end our invention consists in the provision of means whereby the light, or other translating device may be supplied with current the voltage of which is automatically regulated in accordance with its requirements.

in the oase'oi search lights or projectors it is necessary that the voltage at the terminals of the lamp decrease as the current tends to increase. In ordinary practice as above mentioned, this result is obtained by the use of series resistances. with our invention we provide a motor generator set of suitable capacity and pro- I vide it with a novel arrangement of winding connections whereby the search light or projector, or other translating device may be supplied with current as its lGqLlllOmOntS demand.

The novel'ieatures which characterize our invention are pointed out with particularity in the appended claims.

The invention itself will be bctterunder stood by reference to the following descriptrontaken in connection with the accompany ng drawings which represent diagran 1-,

jmatically one of the various embodiments which our invention ,may assume in practice.

Referring to the drawings, the main source of current is indicated conventionally by supply mains 1 and 2. The projector "which is to receive current indirectly from these mains indicated at 3 and may be of any desired type. The particular construction of the projector'is notimportant so far as our present invention is concerned.

"As an illustration, however, of a projector In accordance ture is driven by the motor.

tures 4 and 5, each having its own tield exciting windings. Instead of being direct connected t is of course obvious that the armatures might be driven synchronously WllJll each. other in anyother suitable and well known way. Each machine is excited bytwo field windings, one a shunt winding and the other a series winding. The shunt winding for the armature 4 isindicated at 6, and for the armature 5 at 7. These windings are shown as connected in series with each other across the leads 8 and 9 ex- 'tendingirom the supply mains 1 and .i The series 'Wlndings of the two machines are indicated at 10 and 11. The winding 10 is in series with the armature 4, and the winding 11 in series with the armature 5, while both armatures with their series windings are connected across the leads 8 and 9.

The projector representative of any tra'nslz'rting device, is connected across the generator armature 5 and its series winding 11. ln connecting the series windings it is to be noted that the series winding 10 for the motor armature L is connected so as to assist the shunt winding 6, while the series .winding 11 for the generator armature 5 is so connectedhs to oppose the shunt field 7. Now as thic are between the electrodes in the search light or projector increases in length as the carbons burn away, the current which the lamp takes decreases. The series held 11 oi-the generator being thus weakened its counter active eilect on the. magnetization due to the shunt winding 7 decreases, and thus the generator field is strcngthcnml. The current in the series winding 1001' the motor, being likewise decreased, thereby causes a corresponding weakening in the field strength of the motor. The motor may thus be caused to speed up and drive. the generator armature faster. The generator voltage may thus be increased both by the strengthening of the generator held and by the increase in the speed at whicl the armav The potential across the lamp terminals and across the shunt field magnet of the lamp thus causes the lamp to feed in the usual manner to'l bring the electrodes toward each other. Thus the same result is accomplished as by the use of a resistance in series with the lamp. \Yith resistance present the lengthening of the arc causes a fall in current thus decreasing the drop in potential across the resistance and so increasing the voltage across the arc terminals.

energy in the resistance.

It is obvious that numerous modifications i may be made in the embodiments of our invention Without departing from the spirit thereof, for which reason We do not wish to he lii'nited to the precise details shown and described.

What We claim as new and desire to secure by Letters Patent 01 the United States, l. The combination of a translating device, a motor-generator set for supplying current to said translating device, and windlugs for said motor-generator set arranged to I increase the voltage supplied to said translating device asthc current tends to decrease and V106 Versa.

2. The combination of a motor-genorator By the use of our invention the same result is secured Without the waste of j ,ees

set, a Winding for each member of the set 1 provided with practically constant excitation, a series winding for each member of the set connected in the case of'one member to, assist the constant excitation, and in the case of the other member to oppose it, and it di'llerentiall wound, and the motor element being compound Wound.

in witness whereof we have hereunto set 1 our hands this 18th day of August, 1905. i l J )HN L. HALL.

A ltll l U hf l RNI Gll'l.

translating device connected across one memlating device. the generator element being 

